ALESIS M-EQ230 - Manual (Page 10)

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Voice Fullness at 120Hz; Boominess at 200 to 240Hz; Presence at 5KHz;
Sibilance at 7.5KHz; Air at 12 to 15KHz
Harmonica Fat at 240Hz, bite at 3-5kHz
Conga Resonant ring at 200 to 240Hz; Presence and slap at 5KHz
Whether used to alter the timbre of an instrument, control
feedback, or improve speech intelligibility, it's important to know
what effect each portion of the frequency spectrum has on the
sound.
In summary, the frequency spectrum can be divided up into six
important sections.
FIGURE 6
AUDIO OCTAVE RANGES
FREQUENCY RANGE WHEN USED PRODUCES WHEN USED TOO MUCH
THIS EFFECT PRODUCES THIS EFFECT
16Hz to 60Hz sense of power, makes music muddy
felt more than heard
60Hz to 250Hz Fundamentals of rhythm makes music boomy
section, EQing can change
musical balance making it
fat or thin
250Hz to 2000Hz Low order harmonics of telephone quality to music
most musical instruments 500 to 1KHz horn-like,
1K to 2KHz tinny,
listening fatigue
2KHz to 4KHz Speech Recognition 3KHz listening fatigue,
lisping quality, "m", "v",
"b" indistiguishable
4KHz to 6KHz Clarity and definition of sibilance on vocals
voices and instruments,
makes music seem closer to
listener, adding 6dB at 5KHz
makes entire mix seem 3dB
louder
6KHz to 16KHz Brilliance and clarity of sounds sibilance, harshness on vocals
As with any signal processor, the M-EQ 230 should be used with
discretion since too much of a good thing can make the sound
worse instead of better. Although it is a wonderful device and will
help your sound a lot, remember that a little goes a long way.
If you're using the
M-EQ 230 for tonal contour of an instrument or
voice, Figure 5 will help you zero in on the key frequencies of
some popular instruments.
Remember: The chart serves only as a starting point. Ultimately,
you must use your ears as a guide.